From 9197c0ae1d5206f74284018c78538a38375af3c1 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Sat, 16 Feb 2019 16:24:09 -0600
Subject: Disallow -o "" in top.

---
 toys/posix/ps.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/toys/posix/ps.c b/toys/posix/ps.c
index 2e5338ea..279a947a 100644
--- a/toys/posix/ps.c
+++ b/toys/posix/ps.c
@@ -1448,11 +1448,12 @@ static void top_common(
   } plist[2], *plold, *plnew, old, new, mix;
   char scratch[16], *pos, *cpufields[] = {"user", "nice", "sys", "idle",
     "iow", "irq", "sirq", "host"};
- 
   unsigned tock = 0;
   int i, lines, topoff = 0, done = 0;
   char stdout_buf[BUFSIZ];
 
+  if (!TT.fields) perror_exit("no -o");
+
   // Avoid flicker and hide the cursor in interactive mode.
   if (!FLAG(b)) {
     setbuf(stdout, stdout_buf);
-- 
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